chore: some possible cleanup / extra testing

[henryiii]

The old black Jupyter code still needs to be removed:

pyhf/pyproject.toml

Lines 78 to 79 in c493c7c

	[tool.nbqa.config]
	black = "pyproject.toml"

(and a line below)

pyhf/pyproject.toml

Lines 81 to 82 in c493c7c

	[tool.nbqa.mutate]
	black = 1

The pytest adpdotps probably could do without the ignores? What are they for?

pyhf/pyproject.toml

Lines 44 to 55 in c493c7c

	addopts = [
	"--ignore=setup.py",
	"--ignore=validation/",
	"--ignore=binder/",
	"--ignore=docs/",
	"--cov=pyhf",
	"--cov-report=term-missing",
	"--cov-config=.coveragerc",
	"--cov-report=xml",
	"--doctest-modules",
	"--doctest-glob='*.rst'"
	]

Some of the options here for pytest might be useful:
https://scikit-hep.org/developer/pytest#configuring-pytest

I’d probably at least put the lower bound requirements into tests, that’s not a public thing really. Keeping the main directory from getting too big reduces user scrolling.

[matthewfeickert]

Thanks for following up here like I requested @henryiii. :) I'll do some cleaning on this soon.